Patent · US Active

Method of disconnecting a drill string at a drill rig

US10167688B2 · kind B2 · utility

5Cited by

10References

13Claims

0Family size

Assignee

Sandvik Intellectual Property AB · SE

Inventors

Johan Jelgert · Lindesberg, SE
Lars E. Larsson · Köping, SE
Per Vilen · Nora, SE
Kent Evermark · Karlstad, SE

Key dates

Filing date	Apr 9, 2014
Grant date	Jan 1, 2019
Priority date	—
Expiry date	Apr 9, 2034

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B19/20
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A method and apparatus for disconnecting an end rod from a drill string coupled together by a threaded connection is provided. A rod handling apparatus includes a gripper unit having a floating sled with a sensor unit configured to monitor relative axial position of the sled relative to a frame of the gripper unit to determine a decoupling of the threaded connection and a separation of an end rod from the drill string.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.